Drazice NADO 500/200v7 Specification sheet

Operation and Installation Manual

Storage Tanks

NADO 500/200v7

NADO 750/200v7

NADO 1000/200v7

Družstevní závody Dražice-strojírna s.r.o.

(Works Cooperative - Dražice – Machine Plant, Ltd.)

Dražice 69

294 71 Benátky nad Jizerou

Tel.: 326 370 911, fax: 326 370 980

www.dzd.cz

[email protected]

1. Description

Storage tanks serve accumulation of excessive heat from its source. The source may be a solid fuel

boiler, heat pump, solar collectors, fireplace inserts, etc. Some types of storage tanks allow

combination of connecting even multiple sources.

The NADO type storage tanks serve accumulation of heat in the heating system and allow heating

or preheating of HSW (Hot Service Water) in an inner vessel. Incorporation of a storage tank in the

heating system with a solid fuel boiler allows an ideal run of a boiler at favourable temperature during

the boiler operation. The main benefit lies in the period of optimum operation (i.e. with maximum

efficiency) when the excessive unconsumed heat accumulates in the storage tank.

The tanks and tubular exchangers are made of steel, without the inner surface treatment, the outer

surface of the tank is provided with a protective paint. The storage tanks are manufactured in 500, 750

and 1000-litre volumes. The 500-litre version is additionally equipped with a tubular exchanger of

2.5m2 surface and the 750 and 1000 litre version with a tubular exchanger of 3.3 m2 surface and two

funnels G1½“ mm, with the possibility to install an electric heating element of TJ 6/4“ series with an

extended cooling compartment, up to 6 kW.

The NADO type enables direct heating of HSW (Hot Service Water) in an inner enamelled tank,

or preheating of water for another water heater. Connection to a boiler usually allows direct HSW

heating in an inner vessel to the desired temperature whilst, on the contrary, connection to solar

collectors or heat pump only preheats HSW and another, e.g. electric, heater has to be used, in order to

reheat the water to the desired temperature, or final electric reheat has to be fitted in the storage tank

which is enabled by a TJ 6/4“ series electric heating unit with an extended compartment of up to 6 kW

output.

2. Designing the size and connection of storage tank to the heating system

An ideal size of the storage tank is designed by a design engineer, or a person sufficiently qualified to

design heating systems.

Product assembly must be implemented by an authorised person (confirmed in the warranty

certificate).

Important: When putting into operation, water has to be filled first into the inner vessel for

HSW and the operating pressure inside it has to be kept, only then heating water can be filled

into the outer storage tank, otherwise the product may get damaged!

The manufacturer explicitly emphasises the necessity of being particular in testing the tightness

of the heating circuit (radiators, piping joints, floor heating, etc.) with the connection of the

storage tank. No pressure grow in the storage tank heating water compartment may occur above

the maximum operating pressure of 0.3 MPa, if the heating system is pressurised to higher than

the maximum operating pressure, the inner enamelled vessel may get permanently damaged!

No stop fitting can be put between the security fitting of the heating circuit and the storage

tank!!

3. General dimensions

NADO

500/200 v7

NADO

750/200 v7

NADO

1000/200v7

Storage tank capacity (l)

500

750

1000

Inner vessel capacity (l)

200

Storage tank weight (kg)

166

214

228

Storage tank diameter

600

790

Diameter of storage tank with insulation

800

990

Heating surface of the exchanger (m2)

2,5

3,3

Maximum tank pressure (MPa)

0.3

Maximum pressure of the inner vessel (MPa)

0.6

Maximum pressure of exchanger (MPa)

Maximum temperature of water in the tank and

exchanger (°C)

Maximum output of electrical heating element of

TJ 6/4" series (kW)

2x6

Standing loss (W)

76/128

113/150

126/178

Recommendation

It is recommended to use the product in an indoor environment with air temperatures from +5°C to

45°C and a maximum relative humidity up to 80%.

Connection of the inner vessel to HSW must comply with ČSN 060830, a safety valve has to be fitted

on the cold water inlet.

We recommend checking and cleaning the inner vessel from scale and eventual replacement of the

anode rod after two years of operation. The anode life is theoretically calculated for two years of

operation; however, it changes with water hardness and chemical composition in the place of use.

Prior to commissioning, we recommend that you run the heating circuit and any impurities

that are trapped in the filter clean, then the system is fully operational.

1. Technical description

NADO 500 / 200v7

Funnels 6/4“ are fitted only with NADO750,1000/200v7, for the electric heating element of TJ6/4“

series with an extended cooling compartment!!!

NADO 750 / 200v7, NADO 1000 / 200v7

TYPE

NADO

750/200 v7

NADO

1000/200v7

1940

2240

1606

1906

1560

1406

1606

1896

Thermal insulation

Polyester sheet of 100 mm thickness. It consists

of an upper cover, flange cover and hole caps.

Insulation is supplied in a separate packaging.

We recommend that the insulation was fitted at

room temperature. At temperatures significantly

below 20°C the insulation shrinks. This disables

its easy fitting.

30-9- 2015

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